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Appendix II.


pump. The injection water being drawn through D, and the
exhaust entering at E, the condensed steam and water is delivered
through F, and distributed by the revolving pipe G. Trickling
down the drain pipes at H it finally arrives at the tank j, having
been cooled by the draught of fan K.

Balancing.—When an engine is perfectly balanced there
will be no shock to the foundations, nor indeed are they in that
case necessary; but without such balance, a heavy foundation
must be provided to absorb the momenta of moving parts.
Balancing may be obtained in more than one way, but the
principle is always the opposition of the motion of some heavy
mass to that of the engine parts, in such wise as to make the
opposed momenta changes, or accelerations, nearly equal at all